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On the horizontal axis you see time, and the sleep period written in. On the vertical axis you see hours of phase advance on the top, and hours of phase delay on the bottom. Bright light is represented by dark purple, melatonin by green. Note that the light curve goes both higher and lower than the melatonin, that is because a much larger phase shift can be achieved with light.
Let’s look at an example. Say an adult is unable to sleep until 2am, but must get up for work at 7am. Getting 5 hours of sleep each night is not enought for her. She would like to sleep from 11pm to 7am, but is just not sleepy. Using the Phase Response Curve, she begins using light therapy each morning when she gets up for the day. She also takes some melatonin 6 hours before bed. These combined therapies allow her to feel sleepy at 11pm, and fall to sleep easily. Now she can get a full night’s sleep, and all the benefits of sufficient sleep.